# ο

| ο | U+03BF, &#959; GREEK SMALL LETTER OMICRON |
| ← ξ [U+03BE] | Greek and Coptic | π → [U+03C0] |
| 𝜊 | U+1D70A, &#120586; MATHEMATICAL ITALIC SMALL OMICRON |
| ← 𝜉 [U+1D709] | Mathematical Alphanumeric Symbols | 𝜋 → [U+1D70B] |

## Translingual
### Letter

ο (upper case Ο)
* The lower case letter called omicron (όμικρον); The 15th letter of the Greek alphabet.

### Symbol

ο'
* The cardinal number 70 in Greek numerals.

### Symbol

,ο
* The cardinal number 70,000 in Greek numerals.

### See also

* (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
* (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ ϻ, Ϙ ϙ, Ͳ (S) ͳ (s)
* (punctuation) · ;
* (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨
* ο on Wikipedia.Wikipedia

## Ancient Greek
### Etymology

Derived from its majuscule counterpart Ο.

### Letter

ο • (o) (lowercase, uppercase Ο)
* Lower-case omicron (ὂ μικρόν), the 15th letter of the ancient Greek alphabet. It represented the close-mid back rounded vowel /o/. It is preceded by ξ and followed by π.

#### Derived terms

See also omicron
* ο΄, ͵ο
* о, О (Cyrillic)
* 𐌿 (Gothic)
* ⲟ, Ⲟ (Coptic)
* օ, Օ (Armenian)

### See also

* (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
* (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ (H) ͱ (h), Ϻ ϻ, Ϙ ϙ, Ͳ (S) ͳ (s)
* (punctuation) · ;
* (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

## Greek
### Alternative forms

* ὁ (ho) — polytonic

### Etymology

Inherited from Ancient Greek ὁ (ho).

### Pronunciation

* IPA: /o̞/

### Article

ο • (o) m sg
* the definite masculine singular article. the

#### Declension

1. The final ν is preserved before vowels, and the plosive/affricate consonants: κ, π, τ, ξ, ψ, μπ, ντ, γκ, τσ, τζ Archaic forms used in certain fixed phrases: τοις (tois), τας (tas)

## Pontic Greek
### Etymology

From Ancient Greek ὁ (ho).

### Pronunciation

* IPA: /o̞/

### Article

ο (o) m sg
* (definite) the

#### Declension

| number | singular | singular | singular | plural | plural | plural |
| gender | m | f | n | m | f | n |
| nominative | ο | η | το | οι | οι | τα |
| genitive | τη, του, τση | τη, τση | τη, του, τση | των, τουν, τη | των, τουν, τη | των, τη |
| accusative | τον | την | το | τους, τσου, τοι, τσοι, τοιν, τοις | τους, τσου, τοι, τσοι, τοιν, τοις | τα |
| * The final vowel is canonically deleted when the next word starts with a vowel. This happens in the nominative case as well. * The final ν is deleted when the next word starts with λ, μ or ρ, or when the next word is μου, σου. * Τhe inital τ becomes σ when preceded by the preposition ας. |||||||

## Tsakonian
### Etymology

From Ancient Greek ὁ (ho).

### Pronunciation

* IPA: /o̞/

### Article

ο (o) m sg
* (definite) the

#### Declension

| Number | Singular | Singular | Singular | Plural | Plural | Plural |
| Case / Gender | m | f | n | m | f | n |
| nominative | ο | α | το | οι | οι | τα |
| accusative | το(ν)$^*$ | τα(ν)$^*$ | το | του(ρ)$^*$ | του(ρ)$^*$ | τα |
| genitive | του | τα(ρ)$^*$ | του | του(ν)$^*$ | του(ν)$^*$ | του(ν)$^*$ |
| The final "ν" is preserved before vowels, and the plosive/affricate consonants:   κ, π, τ, μπ, ντ, γκ, τσ, τζ The final "ρ" is preserved before vowels |||||||